In the Linux kernel, the following vulnerability has been resolved: parisc: Increase kernel stack size to 32kb For 64-bit Linux kernels, increase… (CVE-2026-98917)

The Linux kernel's parisc architecture experienced kernel crashes due to insufficient kernel stack size on 64-bit systems. The default kernel stack size (THREAD_SIZE_ORDER) was increased to 32 KB to prevent stack overflows that led to kernel panics, particularly under workloads like compiling the Debian vtk9 package with gcc 17. The vulnerability was identified through kernel panic logs showing low stack detected by IRQ handlers and backtraces indicating stack overflow conditions. This fix mitigates the risk of kernel crashes by allocating more stack space.

Kernel crashes and panics caused by stack overflow conditions on 64-bit parisc Linux kernels could lead to system instability and downtime. This affects system reliability but does not indicate direct code execution or privilege escalation vulnerabilities based on the provided data.

A fix has been implemented by increasing the kernel stack size to 32 KB for 64-bit parisc Linux kernels. Users should update to the Linux kernel version that includes this fix to prevent kernel crashes related to stack overflow. No additional mitigation steps are indicated.